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This section contains two sentences: "The height and the width of the DOMRect of the element." This doesn't seem to be a valid sentence. "The point (0, 0) refers to the top-left corner of the document." 1. Coordination system (x, y) isn't used in other places of the spec so probably you should just link to x/y coordinate definitions from http://dev.w3.org/fxtf/geometry/#DOMRect 2. In current wording it's not clear if top-level or nested browsing context is meant.
https://dvcs.w3.org/hg/webdriver/rev/126717289813